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  • Lesson 1 A puma at large

    spot (v) 看出,发现

    oblige (v) 使...感到必须;obliged (adj)必须的, feel obliged to do sth. 感到不得不做某事 ==have to。eg:Experts felt obliged to investigate.

    somehow (adv) 不知怎么搞地,不知什么原因

    in the possession of, 为...所有

    On being observed, it immediately ran away. 前面划线部分是分词短语,这时候分词短语的时态要看主语。

    Pumas never attack a human being unless it is cornered.

    Pumas never attack a human being except when they are concered.

    unless 与 except后面加单独的句子成分,里面的成分不包含在主体之内。

    could have done----could+动词完成时    表示:(1)过去曾有能力或有可能去做某件事,但未去做;(2)对过去行为的肯定推测

    should have done 表示:(1)过去的动态本应发生而实际却未发生;(2)对过去动作发生的可能性推测

    must be 和can only be   对现在行为的肯定推测

    in a trap陷阱

    intimately熟悉地

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  • 原文地址:https://www.cnblogs.com/CynthiaWendy/p/11062938.html
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